[Webkit-unassigned] [Bug 104724] New: [Chromium] Pre-painting should not paint out-of-view fixed position elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=104724

           Summary: [Chromium] Pre-painting should not paint out-of-view
                    fixed position elements
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: wangxianzhu at chromium.org
                CC: jamesr at chromium.org
        Depends on: 102543


Out-of-view fixed position elements are not composited. In RenderLayer::paintLayer(), such elements will be painted when pre-paint out-of-view parts. This causes residues when the part scrolls into the viewport. Patch of bug 102543 provides a way to determine if a non-composited fixed position element is out-of-view so not to be painted in pre-paining.

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